I quit Facebook in 2012. I cannot imagine what's there but in 2019 I had to create a new account to test some development stuff, and checked friends and family and it was pretty much dead.
Its a ghostown, nothing more that our digital footpritn from we were young and wild.
Facebook is dead among young people, but there are still some dedicated users.
The thing about Facebook is that it's a far more functional social network than the popular alternatives. It's pretty much the go-to for running local community groups.